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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '904e3848b29a4eb6effafa5991ed4d2be4da09fe43ee3747285656ee7982b7cb' 
  AND token = 'JCT4LLybGz+ILs9abaiTpFi4JSuE3nqPUn0w2/ayhS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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