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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4658170130cc6cd6b5f9e5b7837e38f01ca775a52de4c13fe5471ae6c64cfd9' 
  AND token = 'JaWxM7nrFR/RAfOobBF4sixPhsRoPxkPij33lPRLj2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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