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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99db7c4dcd2525cce28ac28018aec9199032bb9dae252acc3840e04b8dca740a' 
  AND token = 'fq7vJUbgm+jMzUZFaoaxncFrOvmtNT/0tVugkskEyBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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