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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '009ea8fd1cf9d6743938116b4a0c1c795f7ba951304273d4a6d86aa5cb52bf3b' 
  AND token = 'oj8Wggtw6R4sMfn1svN3BS6EdC1JUSpq/0lmb6vX0fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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