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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06cd9490dece8606a3b26305a669d4bf719507631dd30007c6b47c45c41edf5a' 
  AND token = 'dEMoPON/V6PUPQUAAkiMwDVcQ2K44XJjUbgQXUs4mi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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