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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9584e7dd3dae709f460df4494cf57ab5bdd00cc81c7d0f34b0e90e4677227ca7' 
  AND token = 'GDmhjdV+I1xjsjkI43MuCeywAdUaN9M3wYkBR/ZMT3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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