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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab3d7d8e56a718f90c822028fbf3e3192e5f352de9e7cf46fafe3553f22a79bc' 
  AND token = 'FNeAy8t5QJS0YjeaD6yavDn0K/ehUdWz5v8kDXOUnjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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