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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f72d8b8996fb7f10c65cd612681d703c3fb4bac13035e8b2ce6216956b3fbc6' 
  AND token = 'eIZMe3L28oAWtxvcQ3w1AIGnqq56OWZi5I9x174ojiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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