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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aeac7acb08dd5bc0a0f1f502883ba1b0975a2e599dd5c9c1eaadb61afd1421e6' 
  AND token = 'vP4chvUVbS4FjpxX0B4YxRtQZdKdEMe5bKGMHbnF7LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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