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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bb00e620f303988851e96aea7c4a54d71469f41bc61e08eab2381faa27f71c6' 
  AND token = 'bfrXATg09Y+CRL0eFUwprBqsF4yyv8OqHopBS5fUtZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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