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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8aff7605b385c3d624ab0d0c88cd73e946463d5793b696c4aaca43762ed7430' 
  AND token = 'rYfYscv0j3waMFPQNU0GB8SN4ejFh4pPwhc4NfqMoHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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