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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c305ddd45669e554a2f52eaf6a7c5231c0944513d7e38a13a5e87be5d5beec3a' 
  AND token = 'pdrd6cJlkfwQDiEBvPWH/y7szjoLQfgc7ezglqlqbpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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