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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '851790ea1f3041f3c33f3465255c1937cf0673bcdc6e4ce75aedef2d16aafc83' 
  AND token = 'L8Bjyqy9Qx0BhTFDnsobBrIXRVB872TCPvGu0VEquFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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