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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c90de12f2e67c7a9edcf466c47b1f2616f12bcce22d2ece409e37903b488b3ea' 
  AND token = 'NjZvbKPAERbPJL74z5RYif/bdryPyWvijy1fYfYNVkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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