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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '976f3e7605ca7be06c4e49bbf6537db8425d6769751c20ba2d40821f2cfbd859' 
  AND token = 'eTHNy7pbCcnjK5B/fzrqn2MB9BTkFW075Kj/OMCiXhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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