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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '343d46f218f209a0a7923c3345770d7f6b777a5ae617ffa33a1f626686817e2b' 
  AND token = 'h3ufQoiFG4IuImNF4GAcd++mL2CsR+BvI9ex90UmsfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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