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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71d2b9264e75d2e7e46e42719d68271f73400ecf39c897d0ff1ee9a0f2c14d97' 
  AND token = '/kq5xstfYbHLgbpPxn3ACiyl4Tr1WwPL2JIS+sQBXmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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