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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66f4582a7aba5c4ef55e54776e54c820d95bc8194853afcbb347b48729cf4cd7' 
  AND token = 'GI+D1hffpNWbuX4BW+GBFDGf1BY9C8g4V7+jauhkKGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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