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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33484d2e106ac67d4cbe61fbbcbf454f508a3855330cd9cf6244eb2e68dbf51a' 
  AND token = 'evUUz7s8PP99CTIL6fAN8oZnbjc32sttlN1vMUP2sHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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