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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7756e3513738a3ab27e6632f2596592b2b561ce5e5161050db91caef32785c90' 
  AND token = '6u89Q1U2YQOuVTv6Cl6usprYHc5e2R5Wa+medijDV/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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