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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a62f503789f39eed5fd771170bf12e1c5ed8be15c1e40f6ff2b1effcbd3168c' 
  AND token = '+RepN/OPxGJPlSx8kNh5p3iUqBIhIGodZuJUwFa1pZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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