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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89862a1170e4683e8688a11b7206ea6d6864d65367cad7f7e361806268f5621a' 
  AND token = 'HuKskUdjJ/vpJX7r3mFV5aca26N66F+27izkCxezXzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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