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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be88b37e527c6264550c66e05ce98c30f8186844d6c61307dcefa9ce829f7a89' 
  AND token = '6lUO2ULnMdrQdBJS23QvZLjF3/9NE/meu9X6bbvVZ2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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