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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2cfb38caae75b4ac18130747bc7fa3db076a2596f3775680281d3d8c1ff5755' 
  AND token = '55dPot0DJz9LeT2ph6JAC69cC3fynRU4WRt2tFe9r5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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