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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fba1920dd149482693e5def4d1241be8c07a61366519e87abd197d67b2ac471' 
  AND token = 'zx5afHFp5MOfVSXTo5JpVf48jpyVyjtq29IS4/B1BBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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