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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48f3df9455739e14446f308396b29e29abda92863420d778fb2a9b9c09e46e23' 
  AND token = 'MWEmqbRHcsxSHMLHAk7qihV5d9bdQnlrlMS9AfeJ0h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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