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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb52f9fd66f5752678fef7d5c1001ace9a130154141a422fca90d0e8b2d4cf7d' 
  AND token = 'QJS271VC4h1CSKkF6mWTyDc+qu0z+RPxC9x+TQNcK8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}