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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9150ffe0b48f672d161eeaf938a11639f78616884826d61e29e946ef4f802826' 
  AND token = 'zWU2vQES79KPPLAp8Pq20v93IFBEfAC97D3rIywOk78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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