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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abfc9f1784985e5b8ee88c045e09e22703f7e97d67dd6fed8c2fa950e3af9b02' 
  AND token = '4UD1Ec6AKyKy3932k4k+zlIRerCieiBi1E6pMABK+o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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