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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ad103619194311c28a85f938f2d371966b97f81062c18625a1948a8b7390a22' 
  AND token = 'AwVqAuXrwcJEH9w4gesDAd7okSVJggnb6+48y6haWeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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