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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e852ff9a941f4d974d22249ca8ec7609145892041b0fe09b431e842df475a09' 
  AND token = 'V+04RyJEZdbshehHPRdp72DX4/7V6xncZ4P6k77KYA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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