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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '879e6a074cfb64c0d868440101201c7dc0376690d4111e46ac730cb9070167fe' 
  AND token = '8Iq26D65k6darfXp5TuifAigczEX7H2sP66oCSCyoIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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