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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f76db939d9e992ef33af09b37190d476d7fe61f59208beded47eabb60c0f614' 
  AND token = 'ooYtQJ0pxnSCLIPN1pXmSGetNhjMoGj+MQmCEyQ+Cag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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