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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed7ea9d04ec5fa1fa0f759f12aceb30b4b4f0321f587154184c133c38444670e' 
  AND token = 'rSUy1W89RrGG/xkjlzgd3aFgtfMeqohPdyBdJGqI5ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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