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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb4ddd1013fe237bf046ca4d810447c1c70718ddeabc3044ce0ef5942e4f957b' 
  AND token = 'BAfHQ5bgKoUgjCfmimVexPByu2c3sNofn6c0p86Cy6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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