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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b07ee593cc0fb1458b3ceeb993cfa6289365b0ce23e10805d4fd2b5d036a65bb' 
  AND token = 'WAvpL+gmWCuIriSjPnP3mg67abImLzciPDpp5E+CrWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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