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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bde10d31a3b188e969e160f208e8ae977ffc276208e9480a22e3a8487beb88d' 
  AND token = '+QRkPqFfu13BphaBWXiJwPist8YFST+Lys2pCHZFQro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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