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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cc1bf29977fa33f28ba31b447b78fe3adf30965d72dd8fb32abc0e513c7d936' 
  AND token = 'BqvRN975b5id/ZXy90qYkFRraCLR0trBRNC1F3FMiHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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