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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0c4d0bb1910704b366d1ee52f7813f1e61471e9568cc7646fa573c263a8de1a' 
  AND token = '6w7NqzrPtQYR7ZNpRcRdF2/h8fme0q2RobdoFb4JfhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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