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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a07e48ce56d44362c50a53322027ea0bc22637e978bf974440bbab9cecea2fd' 
  AND token = '0vV2NR7Ix/GivJQWFxys2Btt+OMky2ALIjABmDDWGd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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