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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2a01e0e0ed513bfcb1a431c1d0c4bba97251682edea2e39a8ba41daaaf1ce2d' 
  AND token = 'hlfTemf/FkwaCMYlKMby+CZRpWFdO1BdoKMB7VesYkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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