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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'faffcb7643ae4da23df3d3a32b2db14c6f1d36db8ca3d627f2d7aee883f0566a' 
  AND token = 'BDv/SFuTU+xRo3d+KqsA8AopXAmbPsXC6RqIO9WG8zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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