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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '176610633b54ab426aa6bc1f73deac7ebdaeff974cc0db6a3b6a3e279a52f0a9' 
  AND token = '5UUVOnxFzjtgcsMNHKFxRQUC1YURqb23RyZ+1axHU5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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