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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd56ac6d557385a0a5fef7b3f3c48c975db0943ecbb20a9c290c304f823f50a31' 
  AND token = '54tk2xQBXMFb/U1hwRoWnwfLFcI1c2yWX7Ffq1fVahc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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