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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb8d38f5c66d84e5ac1ec9db58ed0888f0677d3d0e29b0a63febbd5df4daa770' 
  AND token = 'SCwSZ93SfASoaXXnn3lxecm8K1Cq0s1/M2ujONPA/2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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