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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e03bdd9d4876da736e47ef0bde66989b0d9af05ae9d0ba3211f90dc553e9e71c' 
  AND token = 's/bGbx3a1IflADDePyV89XdyiY8QaYWpxBIye84AW48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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