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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ded61542e87d965c1c604a37bf3a80f0caf18afe456599c74e44cc6229d9223' 
  AND token = 'rWk8u8Iy1JfoCITG1llQo4heh9P6Q6qZJq9NWNGiq1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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