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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fd004c1dbebe37a00a6e27373d6d6b18ea80bd69a21318a1e4c23afed4c7159' 
  AND token = '/PVd82/VBG0slAM+k6RUFYD4l/YQsYxGyIIgNdZmrRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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