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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18610ac10e75667d5328103a9a5f345fee42840b5dd56914b9e16f7fa7328b68' 
  AND token = 'grDtlMLp9xpB99q01+2zMi43FTeZc/0G/U11tINwNcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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