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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ff1424935bdaa96ac0f5eb231db75ea3cdf2217b0fbdb02a58d75fda6a1a445' 
  AND token = 'uz1Tm9+W7QnV54m9/mgudhId4oRiuPUOEWVrM/06R4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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